taken from the on-site information board:
Oll Gries
The medieval stone setting Oll Gries (“Old Codger”) consists of four boulders arranged around a central stone. They were placed there in the late Middle Ages at the earliest. As old cart tracks were discovered near the stone setting, it could be interpreted as a landmark. The interpretation as a medieval landmark is supported by the importance of the road between Oldenburg and East Frisia as an old military and trade route.